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Bisque firing frustrations
neilestrick replied to Gonepotty's topic in Studio Operations and Making Work
Pack the middle the tightest. Have you tried just using the cone 08 preprogrammed firing schedule? -
Replacing elements, what are your thoughts?
neilestrick replied to Roberta12's topic in Equipment Use and Repair
Test the element resistance, it's the best way to know for sure. But with 15 minutes longer and 75 firings they're probably still good. Resistance per section for 240V1P should be about 14.45 ohms. -
Replacing elements, what are your thoughts?
Roberta12 replied to Roberta12's topic in Equipment Use and Repair
@neilestricke23T cone 5.5, Slow glaze slow bisque Yes, we have a meter. I have not measured. Glaze firings, 15 minutes. -
Jarman Porcelain reacted to a post in a topic: Warped rims on my porcelain sculptures
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Replacing elements, what are your thoughts?
neilestrick replied to Roberta12's topic in Equipment Use and Repair
What model kiln is this? Serial number? What cone are you glaze firing to? What schedule do you usually use for glaze firings? Do you have a meter so you can measure the resistance of the elements? https://hotkilns.com/test-resistance-ez How much longer are the firings taking? -
Magnolia Mud Research reacted to a post in a topic: Glazed pieces hung out at 800F degrees - ok?
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Hulk reacted to a post in a topic: Brent CXC wheel stopped spinning - light still on
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Hulk reacted to a post in a topic: Bisque firing frustrations
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Hulk reacted to a post in a topic: Bisque firing frustrations
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Hulk reacted to a post in a topic: PID small kiln
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Hulk reacted to a post in a topic: 100’s of ceramic molds, kilns, supplies,
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Hulk reacted to a post in a topic: 100’s of ceramic molds, kilns, supplies,
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I have elements and TCs on hand, but I have held off changing them. You can see why from the photo. As expensive as elements are, I have hesitated. The reason they have different firings on them is because there was an issue with the top element. I had glaze on it and it burned out. So I changed just those 2 top elements. The top 2 elements have 73 firings, the bottom elements have 62 The kiln is still running, bisque firings are not extended, glaze firings are a little longer. What would you all do? Change them all out? I can't seem to flip the photo. Sorry.
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Hulk reacted to a post in a topic: QotW: Talisman, Bucket or other type of sieve for glaze mixing?
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Roberta12 reacted to a post in a topic: Glazed pieces hung out at 800F degrees - ok?
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Still using "SE 13 1/4 Inch Stackable Classifier Gold Prospecting Pan" for sieving glazes. I'd bought an 80 and 100 mesh. They fit a five-gallon bucket. Looks like the price has almost doubled since 2018 (I'm seeing just over $30 each now). I'm encouraging flow with my rubber gloved hand. The sieve rinses clean easily. For small/test batches, I'm still using this smaller unit, which I'd put together for screening glaze at the JC Ceramic Lab (when I was taking classes there) using 100 mesh stainless steel screen (I still have a few square feet of screen!), a plumbing collar, a section of black pipe that fits in the collar, and some glue. Almost as easy to make several, so I did, and gave the extras away... Still using US Balance 2000g (it will go a bit over 2000g before erroring out) scale (~$26, today, about the same as six years ago). I thought it a reasonable compromise between inexpensive and sufficient to the tasks. The 2000 gram limit means more than one step for some glaze ingredients.
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Glazed pieces hung out at 800F degrees - ok?
Dick White replied to ABlanc's topic in Clay and Glaze Chemistry
At 800 degrees, the glaze particles have not begun to sinter, they are just a little toasty. Fix the kiln and refire. -
Glazed pieces hung out at 800F degrees - ok?
ABlanc replied to ABlanc's topic in Clay and Glaze Chemistry
Thank you! Based on the error message, it might be the relays which we are checking now, or it the kiln was loaded way too bottom heavy. Elements are all good thankfully. Once we get that sorted we will just give it another go - I had just wondered if I needed to reglaze or fire differently the second time since the pieces already fired at 800 degrees for awhile, but I am just overthinking it. -
Glazed pieces hung out at 800F degrees - ok?
Pres replied to ABlanc's topic in Clay and Glaze Chemistry
@ABlancBest bet here is to assess the kiln problem, fix it, and then re-fire the load to ^6. Check your elements to make certain none of them has broken first. If they are in good shape, then the problem is probably in the lead boxes. Is this kiln run on a cone setter or a programmable controller? If in a setter was the cone in the setter still as if unused? best, Pres -
The kiln gods frowned on me last night. My Cone 6 glaze firing errored out and the kiln only got up to 828F degrees before stopping and cooling back down. The pieces look fine - like unfired glazed pieces but the surface looks a little "cooked" or "toasted". Good to just fix the kiln and give it another go? Or did something happen chemistry wise to the glaze hanging out at 800F that I should take note of before refiring? Thanks in advance!
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Bisque firing frustrations
Gonepotty replied to Gonepotty's topic in Studio Operations and Making Work
Thanks Min, yes it only has 1 thermocouple. I'll make note of this info for my next bisque firing -
Bisque firing frustrations
Gonepotty replied to Gonepotty's topic in Studio Operations and Making Work
Thanks so much Pres, super helpful information and great explanation. Feel more confident now with bisque firing -
Bisque firing frustrations
Gonepotty replied to Gonepotty's topic in Studio Operations and Making Work
Thanks Babs, its really helpful to have many reference points/info from different folks as it helps build a bigger picture for me. -
Bisque firing frustrations
Gonepotty replied to Gonepotty's topic in Studio Operations and Making Work
Thanks so much for your repl Thanks so much for your help. I think I'll adjust the firing schedule and make sure I pack it evenly! Really appreciate you taking your time to reply -
Can’t thank you enough
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Thank you, I will try
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No it did not come with a manual and I do not really know how to program the controller( the controller just specifies Pv and Sv
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As much of the density or mass in a firing comes from the shelves themselves it's often helpful to put the taller pots on the bottom shelf, shorter pots and more shelves in the middle of the kiln and tall again on the top shelf. (assuming it has with just one thermocouple or is a manual kiln)
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Density of the load has an effect on the way heat moves in the kiln. Kilns are heated by 3 different forms of heat transfer: Radiant, Conduction, and Convection. Understanding these will help you to understand the need to pack the kiln consistently. Radiant heat is occurs first in the kiln as the elements radiate heat to heat up the air and the pottery. The pottery on the outer edges will heat up to radiate heat towards the center of the kiln. Please note that while Radiant heat is going on Convection is also occurring in the kiln as air heats up and begins to move to the top of the kiln forcing cooler air downward. Overly tight loads will inhibit the movement of air in the kiln causing areas that do not get air to not reach expected cones. However, as this is going on Conduction, where heat is moving through a solid, is taking place, Conduction is a slower process but it allows the pots to heat up from the outside to the inside, and the kiln from the inside to the outside. This good reason to have proper distance from the kiln to outside walls or other materials that could ignite. Hope this helps to answer some of you concerns. best, Pres
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Bread kloche bisque vs cone 6?
neilestrick replied to Biglou13's topic in Studio Operations and Making Work
Thanks @Babs! My bread game drastically improved during Covid lockdown. My 2 teenage boys and I were home every day for 3 months, and we went through 3 loaves a week. I figured out a lot with all that practice. - Yesterday
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Bread kloche bisque vs cone 6?
Babs replied to Biglou13's topic in Studio Operations and Making Work
Now sounding like, in my brain, " what's on your table" topic at start of Covid lockdowns. Amazing bread, Neil. Wouldn't last long around here -
Not knowing the clay you use, or the kiln, here's my bisque in °C. And, Callie the expert, so listen to her. If bisqueware dry and of good thickness i.e not thick sculpted pieces 50°C / hr to 100°C 100°C/hr to 600°C 150°C/hr to 1000°C Soak for 10 minutes. Target is C06. I pack bottom shelf with taller stuff, rest of kiln is tumble packed. Soak at end for me is to allow kiln temp to even out and tumble stacked ware to get to the cone target. Seems brutal but works
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Suggestions for pottery tool bag
MKG001 replied to MKG001's topic in Community Marketplace – Buy/Sell/Trade/Free
Thanks everyone!
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Recent Status Updates
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Hi all, any and all questions posted by me will be related to an ongoing research I am currently conducting on the possible applications of biophilic design in creating sound generating pottery. I came across a captivating story on ancient sounds being recorded on pottery only to realize that it was all a hoax. Anyway, it led me to exploring other ways in which we could probably include mechanisms that could create sound through clay/ceramics/pottery. I am exploring an indirect implication of biophilic or natural elements such as the imitation of the sound of wind, water, bird sounds etc. through pottery all while figuring out if there is a niche for this.· 0 replies
It would be extremely great if I get responses and any help of the sort would be very much appreciated. Thanks!
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There's a skip full of IFB for free. Now to work out how many I can fit in my car/garden.· 2 replies
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I recently purchased a used "Duncan - The Teacher" kiln and cannot get it to work. I am powering it with a NEMA plug and 8/3 wire to a 40 amp breaker [unit is rated at 2700 amps]. It is only 8' from the breaker panel. I have tested the outlet and it has power. Can anyone advise me with this problem?· 3 replies
Thank you,
Fred Y.
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